0.485*102-48.5 怎么才能简便计算

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0.485*102-48.5 怎么才能简便计算

0.485*102-48.5 怎么才能简便计算
0.485*102-48.5 怎么才能简便计算

0.485*102-48.5 怎么才能简便计算
=0.485*(100+2)-48.5
=0.485*100+0.485*2-48.5
=48.5+0.97-48.5
=0.97

0.485*102-48.5=0.485*102-0.485*100=0.485*(102-100)=0.485*2=0.97
或用计算机

0.485*102-48.5
=0.485*(100+2)-48.5
=0.485*100+0.485*2-48.5
=0.485*2
=0.97

0.485*102-48.5 =0.485*(100+2)-48.5=48.5+0.97-48.5=0.97
0.485*102-48.5=0.485*102-0.485*100=0.485*(102-100)=0.485*2=0.97